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Theory of Operation
Hardware
•The STS2 operator interface in the Color Graphical Display unit is designed to provide all of the information required to configure and monitor the unit’s operation.
•The control logic performs automatic operations with minimal operator interface.
•Each STS2 unit is equipped with either a color LCD touch screen or a panel of LEDs and push buttons.
•The STS2 can have optional communication ports installed. See 6.0 - Options and 12.0 - Com- munication Interfaces on page 76 for more information on communication options.
•On LED Display units, the
Firmware
The operator interface enables you to monitor the STS2, to configure set points for transfers, monitor system parameters and access event and history logs. The firmware is accessible through the LCD touch screen (if installed) or the
•View and set the preferred source.
•View and configure set points.
•View alarms, faults and status.
Additionally, the Color Graphical Display unit provides:
•The mimic graphical representation of the systems operation.
•Menu driven monitoring and configuration.
•
•Help on event messages.
•Touch screen alarm reset and silence buttons.
Events in the system, both faults and alarms, are detected and displayed on the LCD. See 11.0 - Alarm and Faults on page 71 for more information on events.
•A set of event masks can be configured through the LCD to trigger a system response to an event. See 11.1 - Event Mask.
•Report event conditions from other components of the system.
•Monitor and report changes in event condition states. If the event condition’s state changes from inactive to active, a new event is detected. If the transition is from active to inactive, the event con- dition has cleared.
•Process new faults and alarms, and clear inactive alarms.
•Provide the alarm reset and silence options.
9.2.2Circuit Breakers
Three circuit breakers provide total isolation of the
All switches in the STS2 are
See 15.2.5 - Circuit Breakers for specifications and more information pertaining to the circuit breakers. See Figure 14 to Figure 19 for circuit breaker locations. The circuit breaker schedule is provided in Figure 20.
9.2.3SCRs
62